[gordner]

HID have mandated cut off areas to avoid blinding other drivers. I would not be surprised if in the changeover the idea of an owner adjusting his headlights was quashed along the way, to prevent you setting them high and causing accidents. The function is probably intentionally buried and labour intensive to do, all in an effort to stop you doing it.

If I were you, before adjusting, I would drive ahead of that van at night and see if they should be raised, from the perspective of the vehicle in front. Better for you to have to use high beam when necessary to see further than to have that all the time at the cost of blinding everyone else.